<s>
The	O
Pentax	B-Algorithm
Spotmatic	I-Algorithm
refers	O
to	O
a	O
family	O
of	O
35mm	O
single-lens	B-Algorithm
reflex	I-Algorithm
cameras	I-Algorithm
manufactured	O
by	O
the	O
Asahi	O
Optical	O
Co	O
.	O
Ltd.	O
,	O
later	O
known	O
as	O
Pentax	B-Application
Corporation	O
,	O
between	O
1964	O
and	O
1976	O
.	O
</s>
<s>
All	O
Pentax	B-Algorithm
Spotmatics	I-Algorithm
used	O
the	O
M42	B-Algorithm
screw-thread	I-Algorithm
lens	I-Algorithm
mount	I-Algorithm
which	O
was	O
developed	O
after	O
World	O
War	O
II	O
by	O
Zeiss	O
and	O
Praktica	O
.	O
</s>
<s>
Later	O
models	O
Spotmatic	B-Algorithm
F	O
,	O
Electro	O
Spotmatic	B-Algorithm
,	O
ES	O
,	O
and	O
ESII	O
were	O
capable	O
of	O
open-aperture	O
metering	O
when	O
used	O
with	O
Super	O
Multi	O
Coated	O
(	O
S-M-C	O
)	O
Takumar	O
lenses	O
with	O
an	O
aperture	O
coupling	O
prong	O
in	O
the	O
lens	O
mount	O
.	O
</s>
<s>
Honeywell	O
was	O
the	O
U.S.	O
importer	O
of	O
the	O
Spotmatic	B-Algorithm
.	O
</s>
<s>
Cameras	O
officially	O
imported	O
by	O
Honeywell	O
were	O
labeled	O
Honeywell	O
Pentax	B-Application
,	O
instead	O
of	O
Asahi	O
Pentax	B-Application
.	O
</s>
<s>
The	O
Spotmatic	B-Algorithm
IIa	O
was	O
only	O
available	O
as	O
a	O
Honeywell	O
Pentax	B-Application
;	O
it	O
was	O
sold	O
exclusively	O
in	O
the	O
USA	O
and	O
had	O
an	O
electronic	O
interface	O
for	O
specific	O
Honeywell	O
Strobonar	O
electronic	O
flash	O
units	O
.	O
</s>
<s>
The	O
original	O
1964	O
Spotmatic	B-Algorithm
was	O
one	O
of	O
the	O
first	O
SLRs	B-Algorithm
on	O
the	O
market	O
to	O
offer	O
a	O
through-the-lens	O
(	O
TTL	O
)	O
exposure	O
metering	O
system	O
.	O
</s>
<s>
The	O
camera	O
was	O
presented	O
as	O
a	O
prototype	O
at	O
photokina	O
1960	O
,	O
and	O
was	O
originally	O
designed	O
to	O
use	O
spot	B-Algorithm
metering	I-Algorithm
.	O
</s>
<s>
Shortly	O
before	O
production	O
Asahi	O
decided	O
that	O
spot	B-Algorithm
metering	I-Algorithm
would	O
be	O
too	O
difficult	O
to	O
use	O
,	O
and	O
so	O
the	O
metering	O
system	O
was	O
altered	O
to	O
use	O
center-weighted	B-Algorithm
average	I-Algorithm
metering	I-Algorithm
.	O
</s>
<s>
The	O
change	O
took	O
place	O
too	O
close	O
to	O
production	O
to	O
change	O
the	O
name	O
,	O
and	O
so	O
Spotmatic	B-Algorithm
stuck	O
.	O
</s>
<s>
Two	O
budget	O
models	O
:	O
the	O
SP500	O
and	O
SP1000	O
were	O
also	O
available	O
and	O
some	O
features	O
from	O
the	O
original	O
Spotmatic	B-Algorithm
were	O
removed	O
.	O
</s>
<s>
There	O
was	O
also	O
the	O
Pentax	B-Application
SL	O
,	O
which	O
was	O
identical	O
to	O
the	O
Spotmatic	B-Algorithm
except	O
that	O
it	O
did	O
not	O
have	O
the	O
built-in	O
light	O
meter	O
.	O
</s>
<s>
The	O
Spotmatic	B-Algorithm
II	O
(	O
SPII	O
)	O
heralded	O
the	O
arrival	O
of	O
the	O
SMC	O
lenses	O
.	O
</s>
<s>
Spotmatic	B-Algorithm
IIa	O
was	O
made	O
exclusively	O
for	O
the	O
American	O
market	O
.	O
</s>
<s>
In	O
1971	O
the	O
Electro-Spotmatic	O
was	O
the	O
first	O
aperture-priority	B-Algorithm
,	O
electronic	O
,	O
automatic	O
SLR	B-Algorithm
but	O
was	O
only	O
sold	O
in	O
Japan	O
.	O
</s>
<s>
In	O
1973	O
the	O
Spotmatic	B-Algorithm
F	O
joined	O
the	O
line	O
.	O
</s>
<s>
The	O
Pentax	B-Algorithm
Spotmatic	I-Algorithm
chassis	O
was	O
the	O
basis	O
for	O
the	O
Pentax	B-Application
K2	O
,	O
KX	O
,	O
KM	O
and	O
K1000	B-Algorithm
models	O
with	O
bayonet	B-Algorithm
mount	O
.	O
</s>
<s>
Noted	O
users	O
of	O
the	O
Pentax	B-Algorithm
Spotmatic	I-Algorithm
include	O
:	O
</s>
